I have discovered the plastic eyes used in all these rubber masks are _just_slightly_ wider than a Neopixel Jewel 7-element disc.I popped off the eyes, soldered the leads, hot-glued the eyes right onto the boards, wrapped the edges of the boards in black electrician's tape, made holes in the mask's eye regions, threaded the eyes through like a button through a button hole, and hot-glued the eye assemblies back in place.